It's not that hard to know.
30FG promotion gacha gives 2 Centies or 110 R-shards. If it's R-shards, it's said 110 on the pink banner. If it's Centies, it' said 2.
For the 50FG gacha, it's a bit harder. If it's said "5* moon runes (D)" on pink banner, it's D-tickets. If it's said "EX moonrune (Re)", it's EX equip ticket. If it's only said "5* moon runes", there is a chance to be a 5* stone.